For launch-day traffic

Survive your launch day

You are posting to HN or Product Hunt tomorrow. You need to know what breaks — and what it costs — before the traffic arrives.

What keeps you up at night

—The free tier collapses under a traffic spike and your app goes down on launch day.
—You wake up to a usage bill because egress or compute hours exceeded what you modeled.
—You picked a stack sized for 100k DAU when you actually have 500 — paying for headroom you do not need.
—You have no idea which component fails first when traffic jumps 10× overnight.

The scaling-cost curve

Every StackPlan report includes a forecast: monthly cost at four DAU levels, recomputed from the same pricing knowledge base as your initial estimate. Drag the slider on the report canvas and watch tiers upgrade — or disqualify — as usage grows.

100 DAUBaseline — often $0–$20/mo on free or hobby tiers

1,000 DAUDatabase and egress start to matter; some free tiers hit hard limits

10,000 DAUCompute concurrency and connection pools become the bottleneck

100,000 DAUTier upgrades, caching, and queue workers enter the picture

Free-tier hard limits

StackPlan does not just compare base prices. Each provider tier carries hard limits — max storage, egress caps, CPU hours, connection counts. When your projected usage exceeds a limit, that tier is disqualified and the engine picks the next viable option. You see the disqualification on the canvas instead of discovering it at 2 a.m.

The math is deterministic and sourced from a versioned knowledge base. The AI explains trade-offs; it does not invent prices.

Model the spike before it hits

Answer the questionnaire with your expected launch traffic. See the full cost curve in your free report.

Plan my stack